<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="root"></div>
    <script src="./vue3基础源码/vue3.js"></script>
    <script>
        const app = Vue.createApp({
            data(){
                return {
                    age:12
                }
            },
            rules:{
                age:{
                    abc:age => age >= 18,
                    mess:"未成年"
                }
            },
            template:`<div>年龄：{{age}}</div>`
        });

        const agePlugin = (app,options) => {
            app.mixin({
                created(){
                    for(let key in this.$options.rules) {
                        let item = this.$options.rules[key];
                        this.$watch(key,(value)=>{
                            const isage = item.abc(value);
                            if(!isage) alert(item.mess);
                        })
                    }
                }
            })
        }

        app.use(agePlugin);

        const vm = app.mount("#root");
    </script>
</body>
</html>